Can anyone please give me a recommended spark plug for a tuned crossflow with fast road cam, big valve head and twin 40's. I know it will only be an approx, but at the mo I have the standard 1600 ones which can't be right and I think are probably not hot enough.

Cheers

burton suggest the following for fast road:

champion QC59C or QC59YC

and quite a range of NGK plugs

if you give em a call they might be a able to tell you whats best